Drill.



UNITED STATES PATENT OFFICE.

JOSEPH CUS'HING, OF OMEMEE, NORTH DAKOTA, ASSIGNOR TO JOHN SULLIVAN, OF GRAND FORK, BRITISH COLUMBIA.

DRILL.

Specification of Letters Patent.

Patented Oct. 9, 1906.

Application filed November 19, 1904. Serial. No. 233.526.

' Omemee, in the county of Bottineau and State of North Dakota, have invented a new and useful Drill, of which the following is a specification.

This invention relates generally to drills, and I particularly to one adapted for use either in drilling wells or for mining purposes.

The object of the invention is to present a thoroughly eflicient and durable drill in the use of which rapid cutting away of the material upon which it is operating may be effected and in which sharpenin ,of thedrill when blunt is greatly facilitate and repairs when necessary are expedited.

With the above and other objects in view,

- as will appear as the nature of the invention is better understood, the same consists in the novel construction and combination of parts of a drill, as Will be hereinafter fully described an? clzltlimed. f

n t e accom an drawin s, ormin a part of this spebifica fifin, and which like characters of reference indicate corresponding parts, there is illustrated one form of embodiment of the invention capable of carrying the same into practical operation, it being understood that the elements therein eX- hibited may be varied or changed as to shape, proportion, and exact manner of assemblage without departing from the spirit thereof.

In the drawings, Figure l is a view in vertical section through a drill constructed in accordance with the present invention, showing the assembling-band or means for holding the drill-sections combined and also a portion of a drill combined with the assemblingband. Fi 2 is a view in elevation of the cutting end of the drill. Fig. 3 is a perspective-detail view of one of the drill members. Fig. 4 is a perspective detail view of a portion of one of the drill members.

The drill, as shown in Fig. 1, is composed of a plurality of members 4, of which there may beany desired number, each member being rovided at one end with a chisel cutting e ge 5, and at its other end, onits outer face, with threads 6, that are disposed below the plane of the face for a purpose that will presently appear.

Each of the drill members is approximately keystone-shaped in cross-section, with the outer face rounded, so thatwhen the members are assembled, as shown in Fig. 2, a drill that is circular in cross-section will be produced. When the members are combined to present a drill, the juncture between. themeeting faces thereof will be such as to preclude entrance of any material therebetween that Would operate to force the members apart, and thus increase the diameter of the drill, and in this instance the assembling is secured through the medium of a band 7, which is internally threaded to engage with the threaded portions 6 of the drill members, the diameter of the band being the same as that of the drill, so that when in position, as shown in Fig. 1, it will, in effect, constitute a continuation of the drill and will not present an obstruction that would tend to retard its operation. The band-assembling device 7 is of greater length than the threaded portions of the drill members and presents a threaded socket at its upper end to receive the lower threaded portion of a drill-stock 8, which may be of the usual or any preferred construction.

By having the drill members approximately keystone-shaped when combined or assembled, as shown in Fig. 2, a bore 9 will be presented through which the dislodged material will find egress to the drill-stock and thence outward. In order to revent the formation of a core that woul operate to close the bore 9 under the operation of the drill, at least one of the drill members has its cutting edge projected to and terminated approximately at the center of the bore, as shown at 10 in Fig. 2, and operates in a manner that will be perfectly apparent to secure the above result.

The drill is adapted for use in minin operations or for sinking oil-wells or the li e and effects its cutting by impact.

When the drill-points have become dulled from use, they may readily be sharpened, and in the case of the breaka e of one of the members its place may readi y be supplied, thereby making unnecessary the discarding of the whole drill for this reason.

While the drill has been described as for use in connection with minin -work or wellsinking, it is to be understoo that it is not sides of all of the said members diverging at the same angle, said sides extendin in radial planes With-respect tothe drill eac member having a outtin edge extending'radiall Withrelationto the rill, allofthe cutting e ges of all ofthe members bein in the same horizon tallplane, the cutting e go of one of the members extending from the center of the drill to the (Periphery thereof,. and an assemblingban constituting a continuation of the drill andhavin its outer side disposed flush with i the like si e of the drill.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

JOSEPH CUSHING.

Witnesses:

J. M. MESSNER, J. N. BLADES. 

